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Optimizing Snapback and Tune Modulation in Particle Accelerators

This document discusses improvements in the snapback process during bare ramp operations in particle accelerators, particularly focusing on tune modulation and sextupole compensation methods. Collaborating with FNAL, key parameters such as the injection value of current and fitting constants (Δb3 and ΔI) have been analyzed to enhance performance. Observations reveal that tunes and chromaticities for both beams remain consistent, with recommendations for monitoring tune correction de-convolution and snapback timings, ensuring optimal beam stability.

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Optimizing Snapback and Tune Modulation in Particle Accelerators

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  1. 2395 – bare ramp bare ramp

  2. bare ramp

  3. Q’ bare ramp

  4. tune bare ramp

  5. bare ramp

  6. bare ramp

  7. Snapback – Q’ • Fit snapback: • I(t) – MB current at time t • Iinjection – injection value of current • b3 and Iare fitting constants • b3 and Iare correlated Sextupole compensation during snap-back in collaboration with FNAL – Luca Bottura bare ramp

  8. Faster snapback bare ramp

  9. Naked versus correction bare ramp

  10. 1545 Tune modulation up ramp bare ramp

  11. Tune 1545 bare ramp

  12. Tune correction 1545 Tune feedback on – some small correction of modulation bare ramp

  13. 1580: QPH correction bare ramp

  14. 1580: QPV correction bare ramp

  15. Naked versus correction bare ramp

  16. 1584 – no tune feedback bare ramp

  17. Observations • Tunes and chromaticities more-or-less identical for both beams • Watch carefully de-convolution of tune correction of tune modulation given by RF frequency modulation • Pseudo spikes at start of ramp; offset in estimate • b3 snapback correction 50% of total swing • Approx total swing: H -34.8 V 25.42 • Snapback time constant looks more or less OK • Most of it’s over after around 21 seconds bare ramp

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